Inflation jumps to four-month high a day after RBA rate rise

The consumer price index climbed from 3.5 per cent in July to 4 per cent in August, according to the Bureau of Statistics, driven by higher housing-related costs and elevated petrol prices.

Housing was the largest contributor to annual inflation in August, rising by 5.7 per cent. Transport was the second-largest contributor, rising by 5.6 per cent due to higher automotive fuel costs.

The underlying rate of inflation, a key guide to the future of interest rates, was unchanged at 3.6 per cent.

The inflation data came a day after the Reserve Bank lifted official interest rates to 4.6 per cent – a 15-year high – in a bid to dampen inflationary pressures. It was the fourth rate rise this year and the bank warned it would lift rates “further if needed” to bring price growth under control.

Following the rate increase, Reserve Bank governor Michele Bullock said that excess demand in the economy has to slow to get inflation down sustainably.

The inflation rate last peaked at 4.6 per cent in March before easing to 3.5 per cent by July. The Reserve Bank’s monetary policy board will meet again in early November to consider any change.

Analysis

Why This Matters

Households with mortgages face further cost-of-living pressure if rates rise again; the RBA has already raised rates four times this year.
Sticky inflation above the RBA's target band undermines confidence that the tightening cycle is over, affecting business investment and consumer spending.
The August CPI print, coming immediately after a rate hike, makes it harder for the RBA to argue it can pause, increasing the likelihood of another move in November.

Background

Australia has been grappling with elevated inflation since 2022, prompting the RBA to embark on one of its most aggressive tightening cycles in decades. The RBA targets inflation between 2 and 3 per cent. After peaking at 4.6 per cent in March, inflation had appeared to be moderating, but August's jump shows the path back to target remains uneven. Housing costs – rents and new home builds – and global energy prices have been persistent drivers.

Key Perspectives

Reserve Bank: The RBA sees excess demand as the primary obstacle to bringing inflation down sustainably. Governor Bullock has signaled readiness to raise rates further if data does not cooperate, prioritising the inflation mandate over growth concerns. Mortgage holders and households: Borrowers face mounting financial strain from successive rate hikes. While inflation eats into real incomes, higher mortgage repayments directly reduce disposable income, especially for those who borrowed heavily during the low-rate era. Economists and critics: Some analysts note that the underlying inflation rate was unchanged at 3.6 per cent, suggesting the headline jump may be partly transitory (fuel prices). They question whether another rate hike is needed when the real economy is already slowing, warning of over-tightening risk.

What to Watch

The RBA board's next meeting in early November, where it will weigh the August CPI, upcoming labour data, and global oil prices.
Petrol prices: whether the rise in automotive fuel costs proves temporary or feeds further into core inflation.
The September quarter CPI release due in late October, which will provide a fuller picture of inflation trends.

Analysis

Why This Matters

Background

Key Perspectives

What to Watch

Sources